Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Holditch Data (notes)
Four page typed chronological notes headed "Holditch Data", listing developments at the mine 1911 to 1921. Pinned top left.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.